The blob() method of the Body mixin takes a Response stream and reads it to completion. It returns a promise that resolves with a Blob.

Syntax

response.blob().then(function(myBlob) {
  // do something with myBlob
});

Parameters

None.

Returns

A promise that resolves with a Blob.

Example

In our fetch request example (run fetch request live), we create a new request using the Request.Request constructor, then use it to fetch a JPG. When the fetch is successful, we read a Blob out of the response using blob(), put it into an object URL using URL.createObjectURL, and then set that URL as the source of an <img> element to display the image.

var myImage = document.querySelector('img');

var myRequest = new Request('flowers.jpg');

fetch(myRequest)
.then(function(response) {
  return response.blob();
})
.then(function(myBlob) {
  var objectURL = URL.createObjectURL(myBlob);
  myImage.src = objectURL;
});

Specifications

Specification Status Comment
Fetch
The definition of 'blob()' in that specification.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

42

411

Yes

39

342

No

29

283

No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No No Yes No No No No

1. From version 41: this feature is behind the Experimental Web Platform Features preference. To change preferences in Chrome, visit chrome://flags.

2. From version 34: this feature is behind the dom.fetch.enabled preference. To change preferences in Firefox, visit about:config.

3. From version 28: this feature is behind the Experimental Web Platform Features preference.

See also

Document Tags and Contributors

 Last updated by: fscholz,